Concentrator



March 16 1926. 1,576,838 H. s. MELLoTT coNcENTRAToR Filed Feb. 4. 1921 i 1;. :l .N

INYENTDR I ATTDRQE Y Patented Mar. 16, 1926.

UNITEDy STATES HOWARD S. MELLOTT, OF MORENCI, MICHIGAN.

CONCENTRATOR.

Application -led February 4, 1921. Serial No. 442,388.

To all whom t may] concern:

Be it known that I, HOWARD S. MnLLo'r'r, a citizen of the United States of America, residing at Morenci, Lenawee County, Michigan, have invented new and useful Concentrators, of which the following is a speciiication.

This invention relates to flowing or impelling treatment of substances, especially in heat transference operations.

This invention has utility as a centrifugal evaporator more particularly for film treatment of milk.

Referring to the drawings:

Fig. 1 is a side elevation with parts broken away of an embodiment of the invention in a centrifugal evaporator;

Fig. 2 is an end view with parts broken away; and

Fig. 8 is an enlarged detail section of the apparatus of Fig. 1, at the discharge.

From the idle pulley 1 belt 2 may be shifted to fast pulley 3 driving shaft 4 extending through the evaporator or heat exchange apparatus having head 5 at one end and head 6 at the other. Between these heads is a cylindrical member having inner smooth wall 7. This cylindrical inember extending between the heads 5, (3, and having the inner smooth wall 7, on its outer side has a roughened or uneven surface 8. The side 7 of this member is the outer wall of the inner chamber, while the side 8 is the inner wall of an outer chamber herein enveloping the inner chamber as a steam jacket. The outer wall of this outer chamber is a cylindrical member 9 to which chamber steam or other heating` substance may be supplied through a plurality of openings 10. In the instance where this substance supplied is steam for flowing over the rougliened surface 8 of the partition member, such steam may condense or flow off as controlled by a valve 11 through a pipe 12. f

Shaft 4 is shown as provided with a hub 13 carrying arms 14 carrying` pivoted blades wall. The substance to he treated, as a flowing material, may be considered as milk,

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warmed to a pre-determined temperature say in the range of 190 F., to enter line 2O and pass by way of slot 21 (Fig. Q) to be drawn therefrom by the ends of mow ing blades 15 and thrown out against the cylinder 7 at a supply rate determined by valve 22. This slot .21 is shown as sinicel but a slight distance from the cylindrical surface 7, say in a thirty-six inch diameter machine, about one inch therefrom. The speed of operation is such that this nate rial is at once thrown vas a thin sheet or film about the interior of the wall 7 blades or impellers 15 seem 'to have a fanningl action as well as a dispersing action and the material is free to flow during this high speed of revolution of the impellers 15, and this flow is toward the remote or opposite head 6 of the apparatus from which it may escape by elongated opening 23 flush with the surface 7 into duct `for pipe 24. Accordingly, there is no head resisting discharge of the treated material.

In practice a vessel three feet in diameter and three feet long may readily handle as low a volume as two quarts, or less, in the machine. The speed of operation as indicated is gaged to urge the materal to change its position as to the wall 7 at such a. rate that the capacity for delivering heat by this copper or good conductor wall or partition may be at a maximum. The capacity per unit of area for this smooth portion of the partition is thus directly mechanically controlled. The conductivity of this partition having the surfaces 7, 8, is very considerable when the material is of copper.

Notwithstanding there is a pressure in the steam jacket say of fifty to seventy-1ive pounds, the capacity per unit of area for extracting this heat from the steam and getting it through this partition 8, 7, is increased as the exterior area is increased. T0 this end, this partition has the roughened surface 8 increasing the capacity of this The lil

partition for lowering the temperature of the steain or other substance in the jacket ane accordingly increasing the rate of heat transference from the jacket to the surface 7. This great rate of heat travel through this partition built up on the outside by the surface area increase and built up on the inside by the speed for shifting,l the material, means a great capacity per unit area of this apparatus, which may run for milk, upward of two hundred pounds per square foot per hour with but one quart in the machine and accordingly the interval of treatment being` as brief as four seconds. At once upon the milk in this chamber being subjected to this heat treatment, it liui'i's up with bubbles, but such bubbles due to their less specific gravity are so consistently dispersed by the spring` metal impellers 15 that the heavier particles of material are continually so thrown that the Wall 7 is bombarded therewitl by a condensed liquid or semi-liquid having almost instantaneous Vransferimition` to partial gas, such gas et' lighter specific gravity escaping from the bubbles as the collapsed bubble wallsv then more toward the surface 7.

From this interior of the vessel 7, such escaping vapors may pass through the open end V5 by way of sha-ft 25 to be 'thrown ofi1 by the stack height or by fan, as may be desirable. The proportion of Water removed may be suoli as to condense the milk from three volume to one volume, or eren less.

What is claimed and it is desired yto cure hy United States Letters Patent is l. ln a heat transference apparatus, a cylindrical chamber having a head, impelling means in the chamber, a jacket for the chamber, a supply Way embodying a pipe, and a slot terminus for the pipe spaced from the cylindrical portion of the chamber in said head to preclude back action thereinto by the impelling` means and extending in the direction of the impelling means travel to coact for withdrawal of material from the pipe. i

2. A heat transference apparatus embodyingl a horizontal cylindrical chamber having a head, and an intake opening of slot form in the head spaced from the cylindrical portion of the chamber to interpose resistance against back flow thereinto, a second head, and an outlet in the second head flush with the cylindrical portion of the chamber for ready discharge flow therefrom.

3. A heat transference apparatus en'ibodying a cylindrical chamber, means for impelling' substance therein continuously as a tubular layer, and a steam jacket for the chainber, said. chamber havingl a sheet metal wall corrugated on the jacket side thereof only.

ln Witness whereof I aiiix my signature.

HUVARI) S. MELLOTT. 

